Newborns sleep 16 to 17 hours per day, and that’s completely normal. If it feels like your baby is sleeping all the time, it’s because they essentially are. Their brains and bodies are doing enormous amounts of work during those hours, and sleep is the engine driving nearly all of it.
That said, there’s a real difference between a baby who sleeps a lot and one who can’t be roused. Understanding where that line falls can save you a lot of worry.
How Much Sleep Is Normal
In the first few weeks of life, most newborns sleep between 16 and 17 hours out of every 24. But they rarely sleep more than one or two hours at a stretch. Their sleep is broken into short bursts around the clock, with no real distinction between day and night. This can make it feel like your baby is always asleep, even though each individual nap is brief.
Newborns also spend roughly half their sleep time in active (REM) sleep, compared to about 20 to 25 percent in adults. During REM sleep, you might notice your baby twitching, fluttering their eyelids, or making small sounds. This isn’t a sign of restlessness. Active sleep plays a critical role in brain development, and newborns simply need far more of it than older children or adults do.
Growth Spurts Can Add Hours of Sleep
If your baby suddenly seems to be sleeping even more than usual, a growth spurt is one of the most common explanations. Research from the American Academy of Sleep Medicine found that infants experience irregular bursts of sleep, with total daily sleep jumping by an average of 4.5 hours for about two days at a time. During these bursts, babies also took about three extra naps per day.
These sleep surges weren’t random. Measurable increases in body length tended to follow within 48 hours of the extra sleep. Each additional hour of sleep raised the probability of a growth spurt by 20 percent, and each extra nap raised it by 43 percent. In short, your baby may be sleeping more because they are literally growing. The growth doesn’t just happen to coincide with sleep. It depends on it.
Growth spurts don’t follow a strict calendar, and they vary from baby to baby. But if your newborn is suddenly harder to keep awake, is feeding well when they do wake, and seems healthy otherwise, extra sleep for a couple of days is rarely a concern.
Normal Sleepiness vs. Lethargy
This is the distinction that matters most. A baby who sleeps a lot but wakes for feedings, looks around, has good muscle tone, and cries with normal energy is a sleepy newborn. A lethargic baby is something different.
Lethargic newborns appear to have little or no energy. They’re drowsy or sluggish, hard to wake for feedings, and even when they are awake, they don’t respond normally to sounds or visual stimulation. Their bodies may feel floppy rather than having the usual flexed posture of a healthy newborn.
The key test is rousing. A normal sleepy baby will wake up when you undress them, stroke their feet, or change their diaper, even if they’re reluctant about it. A lethargic baby stays difficult to wake despite your efforts, or falls immediately back to sleep without feeding.
Jaundice and Sleepiness
Jaundice is one of the most common medical reasons a newborn becomes unusually sleepy. It happens when a pigment called bilirubin builds up in the blood faster than a baby’s immature liver can process it. Mild jaundice is extremely common and usually resolves on its own, but higher levels of bilirubin can make babies increasingly drowsy and hard to feed, which creates a cycle: the sleepier they get, the less they eat, and the less they eat, the harder it is for their body to clear the bilirubin.
Watch for yellowing of the skin that spreads beyond the face to the belly, arms, or legs. Yellowing in the whites of the eyes is another signal. If your baby’s skin is becoming more yellow and they seem listless or unusually hard to wake, that combination needs medical attention promptly. Severe untreated jaundice can, in rare cases, affect the brain.
Feeding and Hydration as a Guide
One of the most practical ways to gauge whether your baby’s sleep is healthy is to track what’s happening at the other end. In the first days, breastfed newborns need to eat 8 to 12 times in 24 hours, roughly every two to four hours. In the very first days of life, feedings may come as often as every one to three hours.
If your baby is sleeping through feeding windows and you can’t wake them to eat, that’s worth paying attention to. Newborns who are getting enough milk produce a predictable pattern of wet diapers:
- Day 1: 1 to 2 wet diapers
- Days 2 to 3: 2 to 4 wet diapers
- Day 4: 4 to 6 wet diapers
- Day 5 onward: 6 or more wet diapers per day
If your baby is meeting these diaper counts, gaining weight, and waking to eat regularly even if they sleep heavily between feeds, the amount of sleep is very likely normal. Falling short on wet diapers or consistently sleeping through feeds without waking suggests your baby may need to be evaluated.
Red Flags Worth Acting On
Most of the time, a newborn who sleeps a lot is simply being a newborn. But certain combinations of symptoms call for a phone call or a visit. Contact your baby’s pediatrician if your baby is sleeping more than usual and is hard to wake, seems floppy or unusually limp, is crying more than usual or is very difficult to calm, or has a fever of any degree under three months old.
Seek emergency care if your baby has trouble breathing, appears unresponsive or significantly less alert than normal, or if their skin or lips look blue, purple, or gray. These signs are rare, but they require immediate attention.
Keeping Sleep Safe During Long Stretches
When your baby does sleep for longer periods, the sleep environment matters. Place your baby on their back in their own sleep space, whether that’s a crib, bassinet, or portable play yard with a firm, flat mattress and a fitted sheet. Keep the sleep surface clear of loose blankets, pillows, stuffed animals, and bumper pads.
Avoid letting your baby sleep on a couch, armchair, or in a car seat or swing when not traveling. These surfaces increase the risk of suffocation, particularly during the deep, extended sleep that newborns often fall into. The safest arrangement is the simplest one: baby alone, on their back, on a flat firm surface.